If you have icon on desktop, click on it and go to properties, open files irectory and
then if you'll do it. Put files of trainer in there. If it doesn't works, check if you have ASI Loader.
ASI Loader file can be for example "ScriptHook.dll".
If you don't have files, check your GTA IV version and download Loader for yours version.
Then put it just like the trainer.

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